Adhesives and sealants application in shuttle Buran structure

A list of the adhesive materials and sealants used in the Buran shuttle, as well as their basic physicomechanical properties and ways of application are presented. Purposes for the mentioned materials are presented.     

Adhesive binders for layered alumopolymer composite materials

Results of studies of rheological and physico-mechanical properties of adhesive binders as components of adhesive prepregs based on glass fillers are presented. It was shown that VSK-14mR adhesive binder, which has low dynamic viscosity and high deformation and thermal strength characteristics, provides adhesive prepregs based on glass fiber rovings for layered alumopolymer composite materials.     

Application of adhesive materials for the repair of acting gas pipelines

The materials and equipment developed to eliminate damage in the pipelines that transmit hydro-carbons are presented. The properties of the adhesive materials and processing methods used in the repairs are described.     

Epoxy and polyurethane adhesive materials of elad,aquapol, and acrolat brands and their components

Different groups of chemical products developed and produced at the Macromer Scientific and Manufacturing Company are described and recommended for use in adhesive compositions, including reactive diluents for epoxy compositions, urethane prepolymers, binders for photocurable materials, aqueous polyurethane dispersions. The main characteristics of binders for glues are presented, as well as the prospects for their application in formulas of adhesive compositions.     

Heat- and high-temperature-resistant adhesives for joining carbon and ceramic materials

A review of the literature datas on the application of adhesives based on inorganic binders for joining carbon and ceramic materials was presented and their advantages and disadvantages were revealed. It was concluded that the most preferable for many application fields are polymer carbonizing adhesives with special fillers, and the most promising are the cold-setting adhesives. Datas are presented on the development of new modified ZhTK-14D adhesive compositions that are efficient at temperatures up to 1800°C intended for joining carbon and ceramic materials.     

Adhesive composite materials based on glass and carbon fillers

Grades and physicomechanical characteristics of glass and carbon fiber-reinforced plastics based on adhesive prepregs are presented. Certain fields of application of these materials are shown.     

Design of epoxide adhesive and sealing materials with high thermal conductivity

Epoxide adhesive materials of cold setting developed at OAO Kompozit are presented. It is shown that all the materials have low gas evolution and high thermal conductivity and provide products of aerospace engineering with the mode of thermal control.     

Heat-conducting adhesives based on modified epoxy resins

Main characteristics of heat-conducting adhesive materials used to withdraw heat from warming elements of devices and the joints of electrotechnical equipment are presented. The developed materials, i.e., TsMK-TP adhesive pastes and TPK convenient for application adhesives, are cold-curing compositions based on epoxy-diane resins modified with Laproxide products. They have heat conductivity coefficients of no less than 1.8 W/(m K), are workable in the temperature range of −196 to 150°C (up to 200°C for a short period of time), and do not contaminate optical elements due to minimal gas release under exposure to vacuum and increased temperatures.     

Wet-adhesive materials of oral and maxillofacial region: From design to application

Oral and maxillofacial diseases are a group of high-incidence disorders that affect people's life quality to a great extent, while the wet and highly movable environment of the related regions brings challenges to traditional therapies. Faced with the obstacles of insufficient adhesive strength and ensuing short drug retention time, conventional oral therapeutic agents often have difficulty in achieving their desired efficacy. Oral and maxillofacial wet-adhesive materials have the advantages of excellent wet environment retention, internal stability, plasticity, and clinical potential, thus have become a significant research direction in the field of oral related disorders healing. In the past decade, the development of oral adhesive materials with good wet adhesion has accelerated based on the chemical molecular interaction, physical interlocking, and biological adhesion mechanisms, including biomimetic-inspired materials, naturally derived polymer–based materials and adhesive electrospun fiber films. These fancy wet-adhesive materials can be used for oral mucosal drug delivery, oral vaccination, wound healing, and bone defects treatments. Despite their numerous novel applications, wet-adhesive materials in stomatology still face unresolved challenges from material and biological aspects. Here, advances in designs of oral and maxillofacial wet-adhesive materials are reviewed in terms of design backgrounds, attachment mechanisms, and common classifications. Recent demonstrations of wet-adhesive materials for oral and maxillofacial region medical applications from drug delivery to multifunctional tissue treatments are presented. To conclude, current challenges and prospects on potential applications of oral and maxillofacial wet-adhesive materials are also briefly discussed.     

Mechanisms and applications of bioinspired underwater/wet adhesives

In nature, many organisms can effectively fix to contact substrates and move and prey in complex living environments, such as underwater, seawater, and tidal environments, owing to special secreted chemical components and/or special micro/nanostructures on the adhesive surface of these organisms. Inspired by the adhesive performance of organisms, extensive research related to adhesive components and adhesive surfaces has been conducted recently. To better understand the underlying adhesive mechanisms and facilitate further continuous inspiration, a brief overview of recent wet/underwater adhesive materials is provided herein. First, the adhesive processes and underlying mechanisms of commonly researched organisms, such as mussels, octopuses, clingfish, and tree frogs, are discussed, and the corresponding bioinspired artificial adhesives are presented. Then, the applications of these bioinspired adhesives, such as intelligent robots (signal monitoring and sensing devices), wearable devices (including wet climbing and electronic skin), biomedicines (including wound dressings, bone adhesion, and rapid hemostasis), are presented and summarized. Finally, we offer our perspective on the future challenges and development of bioinspired artificial adhesives.     

New polyurethane adhesives with improved adhesive effect and heat endurance

Thixotropic polyurethane two-part cold-setting adhesives with an improved adhesive effect and heat endurance developed by OAO Kompozit are presented. These adhesives are based on polyester PU-prepolymer (polybutylene glycol adipate) and toluene diisocyanate and contain NEGP-6 additive developed by OOO Macromer SMC. It follows from the presented comprehensive test results that MTK and MTK-1 adhesives meet the requirements for materials used in spacecraft engineering.     

The raw-material base of adhesives and paint materials

The state of the national raw-material base for production of epoxy adhesive and paint materials and components of polyurethane compositions—isocyanates and polyesters—is presented.     

Investigation of rheological properties of modified phenol-formaldehyde oligomers

Comparative results of determining the rheological properties of modified adhesive compositions based on phenol-formaldehyde oligomer, main wood species, and flax shive are presented. Recommendations on the application of modified glues in the production of composite materials are given.     

Properties of adhesive materials used in repair-and-renewal operations

Advantages of repair technologies based on the use of adhesive materials are shown. Basic properties are given for adhesive materials used in repair operations, namely, epoxy-based metal-filled materials; film adhesives and adhesive prepregs; anaerobic repair compositions based on caoutchoucs and acrylates; and epoxy, acrylate, and urethane acrylates used for adhesion under conditions of increased humidity and under water. Some operation technologies for repair and renewal based on the use of adhesive materials are considered, namely, technologies that deal with breakdowns and preventive repairs on oil and gas pipelines, in the aviation industry (repair of honeycomb sandwiches included), in power engineering, and in the chemical and petrochemical industry, as well as those that solve relevant problems of car repair.     

A Mesostructure Multivariant-Assembly Reinforced Ultratough Biomimicking Superglue

The imitation of mussels and oysters to create high-performance adhesives is a cutting-edge field. The introduction of inorganic fillers is shown to significantly alter the adhesive's properties, yet the potential of mesoporous materials as fillers in adhesives is overlooked. In this study, the first report on the utilization of mesoporous materials in a biomimetic adhesive system is presented. Incorporating mesoporous silica nanoparticles (MSN) profoundly enhances the adhesion of pyrogallol (PG)–polyethylene imine (PEI) adhesive. As the MSN concentration increases, the adhesion strength to glass substrates undergoes an impressive fivefold improvement, reaching an outstanding 2.5 mPa. The adhesive forms an exceptionally strong bond, to the extent that the glass substrate fractures before joint failure. The comprehensive tests involving various polyphenols, polymers, and fillers reveal an intriguing phenomenon—the molecular structure of polyphenols significantly influences adhesive strength. Steric hindrance emerges as a crucial factor, regulating the balance between π-cation and charge interactions, which significantly impacts the multicomponent assembly of polyphenol-PEI-MSN and, consequently, adhesive strength. This groundbreaking research opens new avenues for the development of novel biomimetic materials.     

花生叶表面的高黏附超疏水特性研究及其仿生制备

花生是一种常见的豆科作物.与低黏附超疏水的荷叶不同,花生叶表面同时具有超疏水和高黏附特性.水滴在花生叶表面的接触角为151±2°,显示出超疏水特性.此外,水滴可以牢固地附着在花生叶表面,将花生叶翻转90°甚至180°,水滴均不会从表面滚落,显示了良好的黏附性(黏附力超过80μN).研究发现,花生叶表面呈现微纳米多级结构,丘陵状微米结构表面具有无规则排列的纳米结构.花生叶表面特殊的微纳米多尺度结构是其表面呈现高黏附超疏水特性的关键因素.结合实验数据,对花生叶表面特殊浸润性机理进行了简要阐述.受此启发,利用聚二甲基硅氧烷复形得到了与花生叶表面微结构类似的高黏附疏水表面.本文以期为仿生制备高黏附超疏水表面提供新思路.     

Single-component silicon sealing materials

Single-component silicon adhesive sealant of cold vulcanization based on liquid polyorganosiloxane resins with terminal hydroxyl groups designed at the State Research Institute of Chemistry and Technology of Organoelement Compounds are presented. It was demonstrated that due to their high performance characteristics, in particular the wide range of working temperatures (from −90 to +300°C), these materials draw interest from both civilian and special fields of industry. Methods of producing single-component silicon adhesive sealants were considered.     

偶氮苯高分子的光致可逆固液转变

偶氮苯化合物是一种极具吸引力以及较为常用的光响应材料,本文主要介绍偶氮苯的光响应性质以及一些偶氮苯高分子的合成方法,解析光化学反应导致偶氮苯高分子固液转变的机理,并介绍其在粘结性材料、光致动器、光致热导开关器件及非热纳米压印中的应用。     

Study of physicochemical interactions in metal–polymer systems

This article deals with the investigation of adhesive joints of unlike metals separated by layers of thermoplastics. Experimental data are presented on electrical conductivity of polymers at temperatures of 333–573 K in the electric field of 1–10² V/cm. Infrared (IR) spectroscopy data have been used to establish correlation between the parameters of the voltage generated on the metal–polymer specimens and the existence of groups that can form hydrogen bonds. Adhesive strength of the adhesive joints is discussed in connection with the performance of a metal–polymer–metal voltaic couple when the adhesive joints are being formed. The results presented allow a conclusion that polymeric dielectrics exhibit properties of electrolytes when heated in contact with metals. Therefore electrochemical interactions between components of metal–polymer systems should be taken into consideration when predictions are made of performance characteristics of industrial materials based on polymers and metals.